diff --git a/be/src/olap/iterators.h b/be/src/olap/iterators.h
index f1b195f8f98d26..05b8bd63ed0fcb 100644
--- a/be/src/olap/iterators.h
+++ b/be/src/olap/iterators.h
@@ -92,6 +92,8 @@ class StorageReadOptions {
     int block_row_max = 4096 - 32; // see https://github.com/apache/doris/pull/11816
 
     TabletSchemaSPtr tablet_schema = nullptr;
+    // for unique key merge on write
+    bool enable_unique_key_merge_on_write = false;
     bool record_rowids = false;
     // flag for enable topn opt
     bool use_topn_opt = false;
diff --git a/be/src/olap/rowset/beta_rowset_reader.cpp b/be/src/olap/rowset/beta_rowset_reader.cpp
index 0f8ee1715621db..bb11347990c5cb 100644
--- a/be/src/olap/rowset/beta_rowset_reader.cpp
+++ b/be/src/olap/rowset/beta_rowset_reader.cpp
@@ -215,6 +215,8 @@ Status BetaRowsetReader::get_segment_iterators(RowsetReaderContext* read_context
     }
     _read_options.use_page_cache = _read_context->use_page_cache;
     _read_options.tablet_schema = _read_context->tablet_schema;
+    _read_options.enable_unique_key_merge_on_write =
+            _read_context->enable_unique_key_merge_on_write;
     _read_options.record_rowids = _read_context->record_rowids;
     _read_options.use_topn_opt = _read_context->use_topn_opt;
     _read_options.read_orderby_key_reverse = _read_context->read_orderby_key_reverse;
diff --git a/be/src/olap/rowset/segment_v2/segment_iterator.cpp b/be/src/olap/rowset/segment_v2/segment_iterator.cpp
index 24c452f383a11d..ec559f9955e02b 100644
--- a/be/src/olap/rowset/segment_v2/segment_iterator.cpp
+++ b/be/src/olap/rowset/segment_v2/segment_iterator.cpp
@@ -1042,10 +1042,12 @@ Status SegmentIterator::_apply_inverted_index_on_block_column_predicate(
 }
 
 bool SegmentIterator::_need_read_data(ColumnId cid) {
-    // for safety reason, only support DUP_KEYS
-    if (_opts.tablet_schema->keys_type() != KeysType::DUP_KEYS) {
+    if (_opts.tablet_schema->keys_type() != KeysType::DUP_KEYS &&
+        !(_opts.tablet_schema->keys_type() == UNIQUE_KEYS &&
+          _opts.enable_unique_key_merge_on_write)) {
         return true;
     }
+
     if (_output_columns.count(-1)) {
         // if _output_columns contains -1, it means that the light
         // weight schema change may not be enabled or other reasons